Chapter 688

The second piece of the puzzle is in place.

That's the last piece of the algebraic topology puzzle.

In the last month of 2020, Gu Lu and others worked hard for this goal.

That's it.

Time came to the end of the year in a blink of an eye.

2020 has come to an end in an extremely bumpy year.

A new year 2021 begins.

On New Year's Day.

Except for the geometry group, which had an early holiday, the members of the other two teams are still struggling in their respective positions.

New Year's Day is followed by the Spring Festival.

At this stage, the research work of the research group is not as intense as before.

So Gu Lu gave everyone in the research group a seven-day annual leave.

Gu Lu originally thought that he could take advantage of this time to rest and rest.

But.

A phone call.

It is to disrupt all of Gu Lu.

......

The call was from a stranger.

But......

The stranger's first words instantly brought Gu Lu's thoughts back to the past.

"Professor Gu, the Bohai Tunnel is about to be completed!"

Bohai Tunnel!

Hear these four words.

Gu Lu's thoughts returned to the summer of 2017.

Then.

He was just a high school teacher who had just graduated with a PhD.

Under the recommendation of Academician Guo of Huaguo Ocean University, I was fortunate to participate in a pre-construction discussion meeting of a national infrastructure project.

And the infrastructure project discussed at that meeting was none other than the Bohai Tunnel.

The project, which was put on the agenda at the beginning of the millennium and did not begin construction until the summer of 2017, has finally been completed after three and a half years?

In only three and a half years, a submarine tunnel with a length of more than 180 kilometers has been successfully built, which is not a fast speed.

At the same time, it also shows that the level of infrastructure in China has been upgraded to a new level.

When Gu Lu fell into memory, the voice on the other side of the phone continued, "On the occasion of the completion of the project, Chief Engineer Zheng hopes to invite all the personnel who have contributed to the construction of the Bohai Tunnel to witness the opening of the Bohai Tunnel in person!"

"Therefore, on behalf of the Bohai Tunnel project team, I invite Professor Gu to participate in the completion ceremony of the Bohai Tunnel!"

Having said that, because Gu Lu proposed a construction plan for the construction of the Bohai Tunnel three years ago, he still has the title of technical consultant of the Bohai Tunnel on his head.

It's just that he, the technical consultant, no longer has his responsibilities as a technical consultant after the pre-construction meeting.

"It's four days later, Professor Gu, do you have time?" asked the project team member on the other end of the phone.

Four days later, on the second day of the first lunar month, it happened to be Gu Lu's vacation.

There is time.

But......

If he went to attend the completion ceremony, Gu Lu's plans for the entire holiday would be disrupted.

But then again.

The completion of the Bohai Tunnel is such a historic moment, of course, Gu Lu wants to witness it.

Thereupon.

After hesitation.

Gu Lu opened his mouth and replied, "There is time." ”

"Then Professor Gu, tell me your address, and I'll mail you the invitation letter. The staff over there said.

After Gu Lu informed the staff member of the address, he ended the call.

............

Two days later.

Gu Lu received the invitation letter from the project team.

Moreover.

Gu Lu was already on the phone with Academician Guo from Huaguo Ocean University.

Academician Guo will also be present at the completion ceremony that day.

Academician Guo is the former chief scientist of the Bohai Tunnel project team.

Afterward.

Almost a year and a half ago, Academician Guo was not suitable for front-line work due to his advanced age and physical reasons, so he took the initiative to step down from this position.

But......

The Bohai Tunnel is about to be completed.

Academician Guo, the former chief scientist, is always present.

WeChat.

Gu Lu saw the message sent by Su Xi.

Su Xi: "Teacher Gu, do you have any arrangements for this New Year?"

Gu Lu: "I'm going back to Haicheng." ”

Academician Guo currently lives in Haicheng.

Gu Lu's plan was to go to meet Academician Guo first, and then go to Yancheng City to participate in the completion ceremony.

Su Xi: "Then I'll go back with you, just right, while I have time to get together with my friends over there in Haicheng." ”

Gu Lu: "No problem. ”

Su Xi: "Then when are we leaving?"

Gu Lu: "It's this afternoon!"

............

In the afternoon, Yanjing Daxing Airport.

Gu Lu and Su Xi flew to Yancheng by plane.

Nearly in the evening, the plane arrived at Liuting Airport in Haicheng.

At this time, it is the thirtieth year of the Chinese New Year's Eve.

Every household is lit up with lights, preparing for the Chinese New Year's Eve dinner to celebrate the Spring Festival.

And Gu Lu's Su Xi is still alone.

Gu Lu is parents are not there, while Su Xi is parents and relatives are abroad.

The two of them planned to find a hotel to spend the night, and then visit Academician Guo's house tomorrow.

But after Academician Guo called and learned that Gu Lu had arrived in Haicheng, he asked Gu Lu to come to his house for a Chinese New Year's Eve dinner without saying a word.

Gu Lu couldn't help it.

I can only go to Academician Guo's house with Su Xi for Chinese New Year's Eve dinner.

Academician Guo lives in the academician building on the campus of Haida University.

Academician Guo has a son and a daughter, but his two children have settled abroad all the year round, and it is rare for them to return home once during the Chinese New Year.

So in Academician Guo's family, only Academician Guo, the old couple, was there.

Seeing Gu Lu and Su Xi coming over, Academician Guo was of course cordial.

Count it out.

Gu Lu and Academician Guo haven't seen each other for more than three years.

"Gu Lu, we really haven't seen each other for a long time!" Academician Guo's dry hand held Gu Lu's hands, a little excited.

"Old Guo, are you okay?" asked Gu Lu with concern.

"Okay, I'm fine, my body is great, and I eat deliciously. Academician Guo replied with a smile.

After no longer working on the front line, Academician Guo's originally frail body has recovered a lot, and his face is much more rosy than a few years ago.

"I usually water the flowers, play chess, and play two games with your teacher from time to time, and my life is very nourishing. Academician Guo said this, his eyes noticed Su Xi standing beside Gu Lu, and asked with a smile, "Gu Lu, this is your lover, don't you introduce it?"

In Academician Guo's opinion, those who are willing to stay with Gu Lu on Chinese New Year's Eve are either girlfriends or wives.

Su Xi was made red-faced by Academician Guo.

Gu Lu explained, "Old Guo, this is not my lover......

"It's not Madame, that's a girlfriend, I look good at this girl, don't forget to invite me when you get married." Academician Guo didn't give Gu Lu too much opportunity to explain at all, laughed and patted Gu Lu's shoulder, "Come in, the Chinese New Year's Eve dinner is ready, with the two of you, it is finally not so lonely for our couple to spend this Chinese New Year's Eve." ”

Gu Lu smiled helplessly and followed Academician Guo into the living room.